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WASHINGTON (AP) — The first U.S. fatality using self-driving technology took place in May when the driver of a Tesla S sports car operating the vehicle's "Autopilot" automated driving system died after a collision with a truck in Florida, federal officials said Thursday. The government is investigating the design and performance of Tesla's system. Preliminary reports indicate the crash occurred when a tractor-trailer rig made a left turn in front of the Tesla at an intersection of a divided highway where there was no traffic light, the National Highway Traffic Safety Administration said. The Tesla driver died due to injuries sustained in the crash, which took place May 7 in Williston, Florida, the agency said. The city is southwest of Gainesville. Tesla said on its website that neither the driver nor the Autopilot noticed the white side of the trailer, which was perpendicular to the Model S, against the brightly lit sky, and neither applied the brakes. "The high ride height of the trailer combined with its positioning across the road and the extremely rare circumstances of the impact caused the Model S to pass under the trailer," the company said. The windshield of the Model S collided with the bottom of the trailer. By the time firefighters arrived, the wreckage of the Tesla — with its roof sheared off completely — was hundreds of feet from the crash site where it had come to rest in a nearby yard, assistant chief Danny Wallace of the Williston Fire Department told The Associated Press. The driver was pronounced dead, "Signal Seven" in the local firefighters' jargon, and they respectfully covered the wreckage and waited for crash investigators to arrive. The company said this was the first known death in over 130 million miles of Autopilot operation. It said the NHTSA investigation is a preliminary inquiry to determine whether the system worked as expected. Tesla says that before Autopilot can be used, drivers have to acknowledge that the system is an "assist feature" that requires a driver to keep both hands on the wheel at all times. Drivers are told they need to "maintain control and responsibility for your vehicle" while using the system, and they have to be prepared to take over at any time, the statement said. Autopilot makes frequent checks, making sure the driver's hands are on the wheel, and it gives visual and audible alerts if hands aren't detected, and it gradually slows the car until a driver responds, the statement said. Tesla conceded that the Autopilot feature is not perfect, but said in the statement that it's getting better all the time. "When used in conjunction with driver oversight, the data is unequivocal that Autopilot reduces driver workload and results in a statistically significant improvement in safety," the company said. The Tesla driver was identified as Joshua D. Brown, 40, of Canton, Ohio. He was a former Navy SEAL who owned a technology company, according an obituary posted online by the Murrysville Star in Pennsylvania. Tesla's founder, Elon Musk, expressed "our condolences for the tragic loss" in a tweet late Thursday. NHTSA's Office of Defects is handling the investigation. The opening of the preliminary evaluation shouldn't be construed as a finding that the government believes the Model S is defective, NHTSA said in a statement. The Tesla death comes as NHTSA is taking steps to ease the way onto the nation's roads for self-driving cars, an anticipated sea-change in driving where Tesla has been on the leading edge. Self-driving cars have been expected to be a boon to safety because they'll eliminate human errors. Human error is responsible for about 94 percent of crashes. NHTSA Administrator Mark Rosekind is expected to release guidance to states next month defining the federal role in regulating the vehicles versus the state role, and suggesting what laws and regulations states might want to adopt. Federal officials and automakers say they want to avoid a patchwork of state and local laws that could hinder adoption of the technology. Most automakers are investing heavily in the technology, which is expected to become more widely available over the next five years. Like the Model S, the first generation of self-driving cars is expected to be able to travel only on highways and major well-marked roadways with a driver ready to take over. But fully self-driving vehicles are forecast to become available in the next 10 to 20 years. Musk has been bullish about Autopilot, even as Tesla warns owners the feature is not for all conditions and is not sophisticated enough for the driver to check out. This spring, Musk said the feature reduced the probability of having an accident by 50 percent, without detailing his calculations. In January, he said that Autopilot is "probably better than a person right now." One of Tesla's advantages over competitors is that its thousands of cars feed real-world performance information back to the company, which can then fine-tune the software that runs Autopilot. Other companies have invested heavily in developing prototypes of fully self-driving cars, in which a human would be expected to have minimal involvement — or none at all. Alphabet Inc.'s X lab has reported the most crashes of its Google self-driving cars, though it also has the most testing on public roads. In only one did the company acknowledge that its car was responsible for the crash, when a retrofitted Lexus SUV hit a public bus in Northern California on Valentine's Day. ___ Krisher reported from Detroit. Associated Press writer Justin Pritchard in Los Angeles contributed to this report.

Tesla driver killed in crash while using car's 'Autopilot'